I would stay away from the expandables. Carabou might not be any bigger than a deer but you want to make sure you make a pretty good sized hole. A carabou can cover an amazing amount of distance, they are not as prone as whitetails to hole up in the first heavy cover they find. Well actually they might just like that, but the closest heavy cover might be 10 miles away

. Any good sharp broadhead will work. 3 blade Thunderheads are hard to beat, or magnus/zwickey for traditional arrows. I have been looking rather hard at the Razorcap broadheads also, look to be a very tough design.